Which port to use for vacuum advance...
Im working on getting my engine timed and tuned properly.
I have an older Holley double pumper 4777-2
The port that was originally used to run to the vacuum advance is up on the side of the carb, my only other port is down low in front of the carb.
WHen the engine is at idle the side port has zero vacuum on the gauge but my front port shows around 15 on the gauge.
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